Cannot really afford at the moment to have a 7700K, 2080Ti, Ryzen 7 2700x, GTX1660Ti, and eventually a Ryzen 7 1700x and GTX1060 3Gb running all the time at full speed.

I'd recommend phasing out your CPUs first. They are not great in terms of PPD/watt. GPUs are much more efficient at folding. I only really recommend CPU folding if you get free electricity and/or you're trying to keep your room warm.